Abstract

This paper investigates on control strategies of speed control of Induction Motor (IM) drive. There are many methods to control the speed of Induction Motor. Among these scalar and vector control are the most prominent methods. By keeping V/f ratio constant we can attain a maximum torque at wide range of speeds in scalar control. Vector control provides highly desirable performance and they are mostly used for IM control. Vector control can provide maximum torque at low speed and independent control of flux and torque can be obtained as in separately excited DC motor. Pulse Width Modulated (PWM) strategies as conventional space vector PWM(CSVPWM) and Bus clamping PWM (BCPWM) fed voltage source inverter (VSI) are applied to IM. The performance of these strategies are analyzed in terms of Total harmonic distortion (THD), steady state and transient performance operated under no load conditions. The proposed system has been presented in MATLAB SIMULINK platform and the obtained results are experimentally validated on a 3 phase,1 HP IM drive.

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